$ query “AS45903” --type=asn → 1 result(s)

AS45903 · CMCTELECOM-VN

CMC Telecom Infrastructure Company

AS45903 is run by CMC Telecom Infrastructure Company and is a major transit provider, registered in Vietnam. The system announces a respectable 86 528 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in Vietnam.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #4 in Vietnam — Top 10 by reach within country

Basic Information

Country
🇻🇳 Vietnam
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
October 21, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
356 / 38
IPv6 Prefixes (raw / aggregated)
137 / 3
IPv4 Addresses
86 528
Largest IPv4 Prefix
/18 (16 384 addresses)
Largest IPv6 Prefix
/34
Geolocated Countries
🇻🇳 Vietnam (86 528 IPs)
Prefix Changed
October 15, 2026

Reputation

Reputation
Good — 17 flagged IPs out of 86 528 total (0.02%)
Open Proxies
3 known open proxies in this network

Connectivity Summary

Upstream Providers
15 upstreams providing transit
Peers
199 networks exchanging traffic without transit
Downstream Customers
100 downstreams buying transit
Unclassified
12 unclassified BGP neighbors
Degree
326 unique BGP neighbors
Reach
164 networks in customer cone

Upstream Providers (15)

Prefix Lists

IPv4 Prefixes (356 total)

  • 101.99.0.0/18 (16 384 addresses (/18 prefix))
  • 42.96.32.0/19 (8 192 addresses (/19 prefix))
  • 113.20.96.0/19 (8 192 addresses (/19 prefix))
  • 183.91.0.0/19 (8 192 addresses (/19 prefix))
  • 203.205.32.0/19 (8 192 addresses (/19 prefix))
  • 203.171.16.0/20 (4 096 addresses (/20 prefix))
  • 203.205.16.0/20 (4 096 addresses (/20 prefix))
  • 45.122.232.0/21 (2 048 addresses (/21 prefix))
  • 45.122.240.0/21 (2 048 addresses (/21 prefix))
  • 103.63.104.0/21 (2 048 addresses (/21 prefix))
  • 103.63.112.0/21 (2 048 addresses (/21 prefix))
  • 115.165.160.0/21 (2 048 addresses (/21 prefix))
  • 202.134.16.0/21 (2 048 addresses (/21 prefix))
  • 45.122.248.0/22 (1 024 addresses (/22 prefix))
  • 103.9.196.0/22 (1 024 addresses (/22 prefix))
  • 103.63.120.0/22 (1 024 addresses (/22 prefix))
  • 103.108.132.0/22 (1 024 addresses (/22 prefix))
  • 103.224.168.0/22 (1 024 addresses (/22 prefix))
  • 103.229.40.0/22 (1 024 addresses (/22 prefix))
  • 103.246.220.0/22 (1 024 addresses (/22 prefix))
  • 119.82.140.0/22 (1 024 addresses (/22 prefix))
  • 144.48.24.0/22 (1 024 addresses (/22 prefix))
  • 203.205.0.0/22 (1 024 addresses (/22 prefix))
  • 203.205.8.0/22 (1 024 addresses (/22 prefix))
  • 45.122.254.0/23 (512 addresses (/23 prefix))
  • 119.82.130.0/23 (512 addresses (/23 prefix))
  • 119.82.134.0/23 (512 addresses (/23 prefix))
  • 119.82.138.0/23 (512 addresses (/23 prefix))
  • 162.4.8.0/23 (512 addresses (/23 prefix))
  • 163.52.14.0/23 (512 addresses (/23 prefix))
  • 203.205.6.0/23 (512 addresses (/23 prefix))
  • 203.205.12.0/23 (512 addresses (/23 prefix))
  • 45.122.252.0/24 (256 addresses (/24 prefix))
  • 119.82.129.0/24 (256 addresses (/24 prefix))
  • 119.82.132.0/24 (256 addresses (/24 prefix))
  • 119.82.137.0/24 (256 addresses (/24 prefix))
  • 124.158.14.0/24 (256 addresses (/24 prefix))
  • 203.205.5.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (137 total)

  • 2402:5300::/34
  • 2402:5300:4000::/35
  • 2001:df7:6640::/48